NAME

Games::AlphaBeta::Position - base Position class for use with Games::AlphaBeta

SYNOPSIS

package My::GamePos;
use base Games::AlphaBeta::Position;

sub apply { ... }
sub endpos { ... }
sub evaluate { ... }
sub findmoves { ... }

package main;
my $pos = My::GamePos->new;
my $game = Games::AlphaBeta->new($pos);

DESCRIPTION

Games::AlphaBeta::Position is a base class for position-classes that can be used with Games::AlphaBeta. It inherits most of its methods from Games::Sequential::Position; make sure you read its documentation.

This class is provided for convenience. You don't need this class in order to use Games::AlphaBeta. It is, however, also possible to make use of this class on its own.

MISSING METHODS

Modules inheriting this class must implement at least these three methods (in addition to apply() which is required by Games::Sequential::Position): endpos(), evaluate() & findmoves(). If you chose to not use this class, you must also implement a copy() method which makes a deep copy of the object.

Here's a quick description of how the missing methods must work:

findmoves()

Return an array of all moves possible for the current player at the current position. Don't forget to include null moves if the player is allowed to pass.

endpos()

True if the position is an ending position, i.e. either a draw or a win for one of the players.

evaluate()

Return the "fitness" value for the current player at the current position.

METHODS

The following methods are provided by this class.

_init [@list]

Internal method.

Make sure the missing methods are implemented. You probably want to override this though. You might want to call $self-SUPER::_init(@_)> from within the overriding method.

SEE ALSO

The author's website, describing this and other projects: http://brautaset.org/projects/

AUTHOR

Stig Brautaset, <stig@brautaset.org>

COPYRIGHT AND LICENCE

Copyright (C) 2004 by Stig Brautaset

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.3 or, at your option, any later version of Perl 5 you may have available.